Countries have successively introduced a series of supporting policies, and PV power generation has developed rapidly. How should consumers choose PV products? Why is there such a big gap between the quotations of different vendors for solar panels and inverters that look similar?

　　A: Solar PV panels

　　It is mainly divided into 3 grades: A, B, and C. A-grade board is the best, B-grade is a little bit worse, and C-grade board is a recycled board (refurbished old board).

　　A-grade boards can also be subdivided into two levels, A+ and A-, the same as B -grade. The cost of different grades of solar panels is very different, and the selling price will naturally vary significantly.

　　A good PV panel and a poor one has a very large difference in power generation. The PV power plants we install need to be used for at least 20 years. Once the quality problems cause economic losses, the gains outweigh the losses.

　　Therefore, the choice of PV panels must choose the products of regular manufacturers, they have product certification and various inspection certificates, and the quality is guaranteed.

　　B: Inverter

　　The key points that determine the cost of the inverter are the power size and performance. PV panels and inverters are the core of PV power generation, and the quality of the product directly affects important parameters such as its service life, power generation, and attenuation rate.

　　Of course, when choosing an inverter, you must also choose a well-known product. The quality of the inverter will also affect the power generation and the rate of return on investment.

　　C: Bracket, counterweight

　　The bracket is a special bracket for placing, installing and fixing solar PV panels in the solar PV power generation system. The general materials are hot-dip galvanized carbon steel, anodized aluminum alloy, stainless steel and so on. The connection assembly between the brackets must be assembled with nuts and connectors.

　　The main methods of counterweight are cement piers, steel structures, chemical anchor bolts, etc. Households generally use cement piers that have been poured to meet the installation standards as counterweights. Using expansion bolts to fix the bracket on the roof easily damages the waterproof layer of the roof, and will loosen and break after a long time.

　　D: Insurance

　　Whether it is a family or a business, insurance is very, very important. In the event of natural disasters and other accidents, we can enjoy full compensation from the insurance company.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, PV energy storage, UPS, data center and other industries.

　　Solar power generation system with lithium battery energy storage system is a very promising clean energy.